Maintenance

Note: Replace a cracked, fouled, or dirty spark plug. Do Not clean the electrodes because grit entering the cylinder can damage the engine.

5.Set the gap on the plug to 0.030 inch (0.76 mm) (Figure 29).

Adjustments

Note: Wait for all moving parts to stop and remove spark plug wire before servicing, cleaning, or making any adjustments to the unit.

 

Figure 29

1. Side electrode

3. Air gap—0.030 inch

 

(0.76 mm)

2.Center electrode insulator

6.Install the spark plug and the gasket seal.

7.Torque the plug to 17 ft-lb (23 N-m).

8.Connect the wire to the spark plug.

Emptying the Fuel Tank and Cleaning the Fuel Filter

Service Interval: Every 100 hours

The fuel filter (screen) element is located inside the fuel tank (if applicable).

1.Stop the engine and wait for it to cool down.

Note: Drain gasoline for a cold engine only.

2.Disconnect the wire from the spark plug (Figure 10).

3.Close the fuel valve.

4.Disconnect the fuel line by loosening the tube clamp at the carburetor.

5.Open the fuel valve by turning the lever to the open position.

6.Drain the gasoline completely from the tank and fuel line into an approved fuel container.

7.Remove the fuel tank from the mower.

8.Close the fuel valve.

9.Pour a small amount of fuel in the fuel tank, move the fuel around in the tank, and pour it out into an approved fuel container.

10.Install the fuel tank and fuel line.

Adjusting the Self-Propel

Drive

(Self-Propelled Units Only)

If the lawn mower does not self-propel or has a tendency to creep forward when the control bail is released, adjust the drive cable nuts as shown in Figure 31.

DANGER

Checking the operation of the mower with the belt cover removed will allow debris to be thrown in the operator's or bystander's direction and can result in serious personal injury or death.

Do Not operate the unit when cover is not in place.

1.Stop the engine and wait for all moving parts to stop.

2.Remove the belt cover by pulling upward on the back of the cover to unsnap the front and back cover tabs. Remove any debris under the cover.

Figure 30

1.Belt cover tabs

28

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Image 28
Exmark COMMERCIAL 21 manual Emptying the Fuel Tank and Cleaning the Fuel Filter
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COMMERCIAL 21 specifications

The Exmark COMMERCIAL 21 is a top-tier commercial lawn mower designed to meet the rigorous demands of professional landscapers and lawn care providers. This robust machine combines innovative technology with ergonomic features to deliver exceptional performance, reliability, and ease of use.

One of the standout features of the COMMERCIAL 21 is its powerful engine. It is equipped with a reliable, high-performance engine that provides plenty of torque and power for tackling tough mowing conditions. This not only ensures efficiency but also enhances productivity, allowing operators to cover large areas in a shorter amount of time.

A significant advantage of the COMMERCIAL 21 is its patented MicroCut™ dual-blade system. This innovative cutting technology enhances the mowing quality by producing finer clippings. This results in an even cut and a higher-quality finish, leaving lawn surfaces looking meticulously manicured. The MicroCut blades are designed to prevent clogging, even in wet conditions, making the mower versatile for various grass types and environments.

Furthermore, the Exmark COMMERCIAL 21 features a durable and robust construction. Its heavy-duty steel deck can withstand the wear and tear of daily use while providing superior performance over time. The 21-inch cutting deck strikes a balance between maneuverability and cutting efficiency, making it ideal for residential areas, tight spots, and larger lawns alike.

When it comes to comfort, the COMMERCIAL 21 has ergonomically designed controls that make operation intuitive and user-friendly. The adjustable handle and padded grips help reduce operator fatigue during long mowing sessions, enabling professionals to work efficiently without discomfort.

For enhanced usability, this mower also has a quick-folding feature, allowing for easy transportation and storage. This attribute saves valuable time on the job site and ensures that the mower is ready to go when needed.

In addition to its robust features, the Exmark COMMERCIAL 21 incorporates user-friendly maintenance protocols. The easy-access engine and blade chambers facilitate routine checks, and the overall design promotes a longer lifespan with minimal maintenance requirements.

Overall, the Exmark COMMERCIAL 21 stands out in the market for its combination of power, performance, and user-centric design, making it an exceptional choice for professionals looking for a reliable and efficient lawn care solution. With its advanced features and technologies, it consistently delivers a superior mowing experience.
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